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Renesas 74CBTLV3244QG8
- Part No.:
- 74CBTLV3244QG8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74CBTLV3244QG8.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,719
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Product details
Overview
74CBTLV3244QG8 from Renesas Electronics is a low-voltage octal bus switch with dual 4-channel bi-directional switches, 5Ω on-resistance at 3.3V, VCC range 2.3V–3.6V, and industrial temperature support (−40°C to +85°C), used for high-speed 3.3V bus isolation and asynchronous data bus communication.
For engineers reviewing the 74CBTLV3244QG8 datasheet, 74CBTLV3244QG8 pinout, 74CBTLV3244QG8 application, or 74CBTLV3244QG8 equivalent, key selection criteria include bidirectional switching capability, power-off isolation, over-voltage tolerance up to 4.6V, and QSOP-20 package compatibility with standard '244 logic footprints.
Technical Context
The 74CBTLV3244QG8 implements two independent 4-bit bi-directional bus switches, each controlled by an active-low output enable (OE) input. Switching is symmetrical between Port A and Port B, with no direction pin required.
It features true power-off isolation: when VCC = 0V, IOFF leakage remains ≤50µA across A/B terminals, and inputs tolerate −0.5V to +4.6V regardless of supply state-enabling hot-swap and level-shifting use cases in mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3V–3.6V nominal; supports 2.5V and 3.3V system rails without level translation |
| RON (Typ.) | 5Ω at VCC = 3V, IO = 24mA; enables <0.25ns propagation delay for high-speed buses |
| tEN / tDIS | 1–4.5ns enable/disable time; ensures fast bus arbitration and dynamic isolation control |
| IOFF (Max) | 50µA at VCC = 0V; guarantees signal integrity during power sequencing or standby |
| VI/O Tolerance | −0.5V to +4.6V; allows safe interfacing with 5V-tolerant peripherals without external clamping |
| ESD Rating | 2000V HBM, 200V MM; meets industrial handling requirements without added protection circuitry |
| Operating Temp | −40°C to +85°C; qualified for industrial control, networking, and embedded computing environments |
Pinout & Package
74CBTLV3244QG8 is packaged in a 20-pin Quarter-Size Small Outline Package (QSOP, PCG20), 7.2mm × 5.3mm body, 0.65mm pitch, with exposed pad not present. Pinout matches industry-standard '244 logic layout for drop-in replacement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE / 2OE | Active-low enable for first/second 4-bit switch bank; tied to VCC via pull-up for power-up high-impedance safety |
| 2–5, 11–14 | 1A1–1A4 / 2A1–2A4 | Port A I/Os for first/second switch bank; bidirectional, no internal direction control |
| 6–9, 15–18 | 1B1–1B4 / 2B1–2B4 | Port B I/Os for first/second switch bank; electrically identical to corresponding A pins |
| 10, 20 | GND / VCC | Power reference and supply; decoupling capacitor placement critical near Pin 10 (GND) and Pin 20 (VCC) |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible with '244 logic | Enables direct upgrade from TTL/CMOS 74LS244 or 74HC244 without PCB redesign |
| 5Ω typical on-resistance | Minimizes voltage drop and timing skew across 3.3V data lines carrying >24mA |
| Power-off isolation | Prevents back-driving and leakage current paths when VCC is unpowered or ramping |
| Over-voltage tolerant I/O | Supports mixed-voltage interconnect (e.g., 3.3V switch bridging to 5V legacy peripherals) |
| Latch-up immunity >100mA | Guarantees robust operation under transient fault conditions per JEDEC JESD78 |
Applications
| Server Memory Interconnect | Industrial PLC Backplane |
|---|---|
Use Scenario: Isolating DDR memory channels during hot-plug DIMM insertion or firmware update. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling/disabling data path between controller and memory module without clock domain crossing. Use Value: Prevents signal contention and ground bounce during reconfiguration while maintaining sub-nanosecond timing integrity. | Use Scenario: Segregating sensor I/O modules from CPU bus in modular programmable logic controllers. IC Role / Device Role / Timing Role: Octal switch providing galvanically isolated data routing between fieldbus and processor subsystems. Use Value: Enables live module replacement and fault containment without system-wide reset or timing recalibration. |
| Network Packet Buffering | Test Equipment Signal Routing |
Use Scenario: Dynamic routing of packet header/data streams between MAC and PHY layers in 10G Ethernet switches. IC Role / Device Role / Timing Role: Low-latency, low-RON bus switch supporting 2.5+ Gbps serial data bursts with minimal jitter addition. Use Value: Eliminates need for active repeaters or level shifters in short-reach parallel bus segments. | Use Scenario: Reconfigurable signal path selection in automated test equipment (ATE) channel matrices. IC Role / Device Role / Timing Role: Precision-controlled analog/digital bus gate managing stimulus/response routing across DUT interfaces. Use Value: Delivers repeatable 5Ω path resistance and <5µA off-state leakage for calibrated measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3244PWR | Same electrical specs; TSSOP-20 (PGG20) vs QSOP-20 (PCG20); 0.65mm pitch identical, but body width differs (4.4mm vs 7.2mm) | Requires PCB footprint change; better thermal dissipation in TSSOP for sustained 128mA channel loads | Select SN74CBTLV3244PWR if board space allows wider package and higher continuous current margin is needed. |
| 74LVC244APW | Non-bidirectional; 3-state buffer with direction control; RON >15Ω; no power-off isolation; VCC = 1.65–3.6V | Suitable only for unidirectional buffering; cannot replace 74CBTLV3244QG8 in bidirectional or hot-swap scenarios | Choose 74LVC244APW only for cost-sensitive, fixed-direction applications where isolation and bidirectionality are unnecessary. |
Compared with SN74CBTLV3244PWR and 74LVC244APW, the 74CBTLV3244QG8 uniquely delivers bidirectional 5Ω switching with guaranteed power-off isolation in a QSOP-20 footprint-making it the sole option for hot-pluggable, mixed-voltage, or dynamically reconfigurable bus architectures.
Availability
74CBTLV3244QG8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, server memory interconnects, and network packet buffering requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for 74CBTLV3244QG8 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.
The 74CBTLV3244QG8 belongs to Renesas' CBTLV low-voltage bus switch family, engineered specifically for high-speed, low-latency, bidirectional signal routing in 3.3V industrial and communications systems.
FAQ
What is the maximum continuous current per channel for the 74CBTLV3244QG8?
The 74CBTLV3244QG8 supports up to 128mA continuous channel current per switch path, as specified in Absolute Maximum Ratings. This rating applies under steady-state DC conditions with proper PCB thermal design and ambient temperature within −40°C to +85°C. Exceeding this limit risks parametric shift or long-term reliability degradation.
Does the 74CBTLV3244QG8 require external pull-up resistors on OE pins?
Yes-the 74CBTLV3244QG8 requires pull-up resistors on both 1OE and 2OE pins to VCC to ensure high-impedance state during power-up or power-down sequences. The datasheet specifies this as mandatory for reliable operation; floating OE inputs may cause undefined switch states and potential bus contention.
Can the 74CBTLV3244QG8 be used in 5V systems?
The 74CBTLV3244QG8 is not powered from 5V, but its I/O pins tolerate −0.5V to +4.6V regardless of VCC state-enabling safe interface with 5V peripherals when VCC = 3.3V. However, VCC must remain within 2.3V–3.6V; applying 5V to VCC will damage the device.
Is the 74CBTLV3244QG8 pin-compatible with older 74LS244 devices?
Yes-the 74CBTLV3244QG8 uses the same 20-pin '244 pinout (including OE, A/B I/O assignments), allowing mechanical and layout compatibility with 74LS244 and 74HC244. However, it replaces tri-state buffers with bidirectional switches and requires different enable logic (active-low vs active-high in some variants).
What is the typical on-resistance variation across voltage and temperature for the 74CBTLV3244QG8?
RON for the 74CBTLV3244QG8 varies from 5Ω (typ. at VCC = 3V, IO = 24mA) to 40Ω (max. at VCC = 2.3V, VI = 0V, IO = 15mA). Over temperature (−40°C to +85°C), RON increases ~0.05Ω/°C-remaining below 8Ω across full industrial range at 3.3V operation.
74CBTLV3244QG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74CBTLV
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 4 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QSOP
74CBTLV3244QG8 FAQ
1.How can I place an order for 74CBTLV3244QG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CBTLV3244QG8 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 74CBTLV3244QG8 reliable?
The price and inventory of 74CBTLV3244QG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CBTLV3244QG8 is usually 5 days.
3.What payment methods are accepted for 74CBTLV3244QG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74CBTLV3244QG8 transactions.
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4.How is shipping managed for 74CBTLV3244QG8?
74CBTLV3244QG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CBTLV3244QG8 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 74CBTLV3244QG8?
For technical support, including 74CBTLV3244QG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CBTLV3244QG8 requirements.
6.How does Aetrix verify that 74CBTLV3244QG8 is sourced from the original manufacturer or authorized distributors?
All 74CBTLV3244QG8 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74CBTLV3244QG8 meets industry standards.
7.What is the process for return or replacement of 74CBTLV3244QG8?
All 74CBTLV3244QG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74CBTLV3244QG8, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 74CBTLV3244QG8 part is unused and in its original packaging.
Return procedure for 74CBTLV3244QG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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